1) In a randomized block design you:

a) Ensure that treatments are randomly assigned across blocks, and non-randomly assigned within blocks

b) Ensure you have as many blocks as possible, and assign subjects randomly within those blocks

c) Ensure that treatments are randomly assigned across blocks, and assigned randomly within those blocks

d) Ensure that each treatment is present in each block, and assigned randomly within those blocks

2) You wish to test whether corn plants grown in one of three nutrient treatments (control soil, nitrogen-enriched soil, or nitrogen-and-phosphorus-enriched soil) grow at different rates (growth rate). What is the response variable for this experiment?

a) Growth rate

b) Nutrient treatment

3) You are interested in testing whether randomly selected houses are of different sizes in three different suburbs (large and connected neighbourhoods). You collect data on size for 50 houses in each of the neighbourhoods and find they are slightly skewed and that transformation does not improve their normality. Which test do you conduct?

a) ANOVA

b) Two-sample t-test

c) Kruskal-Wallis test

d) Mann-Whitney U-test

4) Correlation is relevant for tests in which:

a) The explanatory and response variables are both categorical

b) The explanatory variable is categorical, and the response variable is numerical

c) The explanatory and response variables are both numerical

d) The explanatory variable is numerical, and the response variable is categorical

5) With a linear regression, we can know for certain that:

a) The y-intercept will be greater than zero

b) The mean of X and Y will be within the 95% confidence limit of the regression line

c) The mean of X and Y will lay on the regression line

d) The y-intercept will be equal to zero

6) You test the number of minutes a person can type both before and after drinking coffee.You find that those who types quickly the first time typed slower after drinking coffee, and that those who typed slowly the first time typed more quickly the second time. Choose the correct interpretation of this pattern:

a) Individuals who were fast at typing were made slower by coffee

b) Individuals who were slow at typing were made faster by coffee

c) Coffee speeds up typing

d) Based on these results, coffee played little role in typing speed and patterns reflect a regression toward the mean.